<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="item in cartInfoList" :key="item.id">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="item.isChecked === 1 ? true : false"
              @input="
                checkedSingleState(item.skuId, item.isChecked === 1 ? 0 : 1)
              "
            />
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl" />
            <div class="item-msg">
              {{ item.skuName }}
            </div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ item.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a
              href="javascript:void(0)"
              class="mins"
              @click="changeSkuNum(item, -1)"
              >-</a
            >
            <input
              autocomplete="off"
              type="text"
              :value="item.skuNum"
              minnum="1"
              class="itxt"
              @change="inputChangeSkuNum(item, $event)"
              @focus="inputChangeSkuOldNum(item.skuNum)"
            />
            <a
              href="javascript:void(0)"
              class="plus"
              @click="changeSkuNum(item, 1)"
              >+</a
            >
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ item.skuPrice * item.skuNum }}</span>
          </li>
          <li class="cart-list-con7">
            <a
              href="#none"
              class="sindelet"
              @click="deleteSingeGoods(item.skuId)"
              >删除</a
            >
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="checkedAll" />
        <span>全选</span>
      </div>
      <div class="option">
        <a href="javascript:;" @click="deleteAll">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ hasCheckedNum }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {
  reqGoodsCartList,
  reqCheckCart,
  reqDeleteCart,
  reqAllCheckCart,
  reqAddGoodsToCart,
  reqDeleteAll,
} from "@/api";
export default {
  name: "ShopCart",
  data() {
    return {
      cartInfoList: [],
      oldSkuNum: 1,
    };
  },
  mounted() {
    // 初始化获取购物车列表信息
    this.getGoodsCartList();
  },
  computed: {
    // 商品全部选中
    checkedAll: {
      get() {
        return this.cartInfoList?.every((item) => item.isChecked === 1);
      },
      set(val) {
        val = val === true ? 1 : 0;
        const skuIdList = this.cartInfoList?.map((item) => item.skuId);
        // console.log(skuIdList,val);
        this.checkedAllGoods(skuIdList, val);
      },
    },
    // 已选择商品总数
    hasCheckedNum() {
      return this.cartInfoList.reduce((p, c) => {
        if (c.isChecked === 1) {
          p = p + c.skuNum;
        }
        return p;
      }, 0);
    },
    // 总价钱
    totalPrice() {
      return this.cartInfoList.reduce((p, c) => {
        if (c.isChecked) {
          p = p + c.skuPrice * c.skuNum;
        }
        return p;
      }, 0);
    },
  },
  methods: {
    // 1.获取购物车列表信息
    async getGoodsCartList() {
      try {
        const re = await reqGoodsCartList();
        // console.log(re, "re");
        // this.cartInfoList = re[0]?.cartInfoList;
        // 给cartInfoList中的每一个值都添加一个isRes=false的属性和一个oldSkuNum属性
        this.cartInfoList = re[0]?.cartInfoList.map((item) => {
          item.isRes = false;
          return item;
        });
        // re[0]?.cartInfoList;
      } catch (e) {
        alert(e.message);
      }
    },
    // 2.修改购物车单个商品的选中状态
    async checkedSingleState(skuId, isChecked) {
      // console.log(skuId, isChecked);
      try {
        // 请求修改数据
        await reqCheckCart(skuId, isChecked);
        alert("修改成功");
        // 重新请求页面
        this.getGoodsCartList();
      } catch (e) {
        alert(e.message);
      }
    },
    // 3.删除单个商品
    async deleteSingeGoods(skuId) {
      try {
        // 请求删除商品
        await reqDeleteCart(skuId);
        alert("删除成功");
        //删除成功后重新发送请求加载页面
        this.getGoodsCartList();
      } catch (e) {
        alert(e.message);
      }
    },
    // 4.全选
    async checkedAllGoods(skuIdList, val) {
      try {
        await reqAllCheckCart(skuIdList, val);
        alert("全部修改成功");
        //修改成功后重新发送请求加载页面
        this.getGoodsCartList();
      } catch (e) {
        alert(e.message);
      }
    },
    // 5.增加/减少购物车商品
    async changeSkuNum(cartInfo, skuNum) {
      //判断计算后商品的数量小于等于0,则直接不再操作

      /* 
        关于连点减少会出现负数的BUG解决思路：
          — 1.再请求回来的购物车列表中给每一个商品添加一个开关(isRes=false)   
          — 2.每一次点击的时候判断isRes是否为false,如果为false则放行，否则直接return掉
          — 3.放行后立马将isRes的值设置为true,
          — 4.知道请求的所有代码全部执行完成以后再将isRes的值设置为false
      */
      if (cartInfo.isRes) return;
      if (cartInfo.skuNum + skuNum <= 0) return;
      cartInfo.isRes = true;
      try {
        // 修改购物车数量
        await reqAddGoodsToCart(cartInfo.skuId, skuNum);
        //修改成功后重新发送请求加载页面
        await this.getGoodsCartList();
        cartInfo.isRes = false;
      } catch (e) {
        cartInfo.isRes = false;
        alert(e.message);
      }
    },
    // 6.批量删除选中的商品
    async deleteAll() {
      const skuIdList = this.cartInfoList.reduce((p, c) => {
        if (c.isChecked === 1) {
          p.push(c.skuId);
        }
        return p;
      }, []);
      // console.log(skuIdList);
      try {
        await reqDeleteAll(skuIdList);
        // 删除完成之后重新加载页面
        this.getGoodsCartList();
      } catch (e) {
        alert(e.message);
      }
    },

    // 7.输入框修改商品数量
    async inputChangeSkuNum(cartInfo, e) {
      //设置正则条件
      const reg = /^[0-9]+$/g;
      //获取输入框的最新值
      const newSkuNum = e.target.value;
      //判断新值是否满足正则，如果不满足则将旧值赋值给输入框
      if (!reg.test(newSkuNum) || newSkuNum <= 0) {
        e.target.value = this.oldSkuNum;
        return;
      }
      //如果满足则直接发送请求
      // 修改购物车数量(先计算出差值)
      let diffValue = e.target.value - cartInfo.skuNum;
      try {
        await reqAddGoodsToCart(cartInfo.skuId, diffValue);
        //修改成功后重新发送请求加载页面
        await this.getGoodsCartList();
      } catch (e) {
        alert(e.message);
      }
    },
    // 8.当鼠标失去焦点时将skuNum旧值赋值给
    inputChangeSkuOldNum(skuNum) {
      this.oldSkuNum = skuNum;
    },
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 4.1667%;
        }

        .cart-list-con2 {
          width: 25%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 12.5%;
        }

        .cart-list-con5 {
          width: 12.5%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 12.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>